1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2 /*
3  * Copyright (C) 2012-2014, 2019-2020 Intel Corporation
4  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
5  */
6 #ifndef __time_event_h__
7 #define __time_event_h__
8 
9 #include "fw-api.h"
10 
11 #include "mvm.h"
12 
13 /**
14  * DOC: Time Events - what is it?
15  *
16  * Time Events are a fw feature that allows the driver to control the presence
17  * of the device on the channel. Since the fw supports multiple channels
18  * concurrently, the fw may choose to jump to another channel at any time.
19  * In order to make sure that the fw is on a specific channel at a certain time
20  * and for a certain duration, the driver needs to issue a time event.
21  *
22  * The simplest example is for BSS association. The driver issues a time event,
23  * waits for it to start, and only then tells mac80211 that we can start the
24  * association. This way, we make sure that the association will be done
25  * smoothly and won't be interrupted by channel switch decided within the fw.
26  */
27 
28  /**
29  * DOC: The flow against the fw
30  *
31  * When the driver needs to make sure we are in a certain channel, at a certain
32  * time and for a certain duration, it sends a Time Event. The flow against the
33  * fw goes like this:
34  *	1) Driver sends a TIME_EVENT_CMD to the fw
35  *	2) Driver gets the response for that command. This response contains the
36  *	   Unique ID (UID) of the event.
37  *	3) The fw sends notification when the event starts.
38  *
39  * Of course the API provides various options that allow to cover parameters
40  * of the flow.
41  *	What is the duration of the event?
42  *	What is the start time of the event?
43  *	Is there an end-time for the event?
44  *	How much can the event be delayed?
45  *	Can the event be split?
46  *	If yes what is the maximal number of chunks?
47  *	etc...
48  */
49 
50 /**
51  * DOC: Abstraction to the driver
52  *
53  * In order to simplify the use of time events to the rest of the driver,
54  * we abstract the use of time events. This component provides the functions
55  * needed by the driver.
56  */
57 
58 #define IWL_MVM_TE_SESSION_PROTECTION_MAX_TIME_MS 600
59 #define IWL_MVM_TE_SESSION_PROTECTION_MIN_TIME_MS 400
60 
61 /**
62  * iwl_mvm_protect_session - start / extend the session protection.
63  * @mvm: the mvm component
64  * @vif: the virtual interface for which the session is issued
65  * @duration: the duration of the session in TU.
66  * @min_duration: will start a new session if the current session will end
67  *	in less than min_duration.
68  * @max_delay: maximum delay before starting the time event (in TU)
69  * @wait_for_notif: true if it is required that a time event notification be
70  *	waited for (that the time event has been scheduled before returning)
71  *
72  * This function can be used to start a session protection which means that the
73  * fw will stay on the channel for %duration_ms milliseconds. This function
74  * can block (sleep) until the session starts. This function can also be used
75  * to extend a currently running session.
76  * This function is meant to be used for BSS association for example, where we
77  * want to make sure that the fw stays on the channel during the association.
78  */
79 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
80 			     struct ieee80211_vif *vif,
81 			     u32 duration, u32 min_duration,
82 			     u32 max_delay, bool wait_for_notif);
83 
84 /**
85  * iwl_mvm_stop_session_protection - cancel the session protection.
86  * @mvm: the mvm component
87  * @vif: the virtual interface for which the session is issued
88  *
89  * This functions cancels the session protection which is an act of good
90  * citizenship. If it is not needed any more it should be canceled because
91  * the other bindings wait for the medium during that time.
92  * This funtions doesn't sleep.
93  */
94 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
95 				      struct ieee80211_vif *vif);
96 
97 /*
98  * iwl_mvm_rx_time_event_notif - handles %TIME_EVENT_NOTIFICATION.
99  */
100 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
101 				 struct iwl_rx_cmd_buffer *rxb);
102 
103 /**
104  * iwl_mvm_start_p2p_roc - start remain on channel for p2p device functionality
105  * @mvm: the mvm component
106  * @vif: the virtual interface for which the roc is requested. It is assumed
107  * that the vif type is NL80211_IFTYPE_P2P_DEVICE
108  * @duration: the requested duration in millisecond for the fw to be on the
109  * channel that is bound to the vif.
110  * @type: the remain on channel request type
111  *
112  * This function can be used to issue a remain on channel session,
113  * which means that the fw will stay in the channel for the request %duration
114  * milliseconds. The function is async, meaning that it only issues the ROC
115  * request but does not wait for it to start. Once the FW is ready to serve the
116  * ROC request, it will issue a notification to the driver that it is on the
117  * requested channel. Once the FW completes the ROC request it will issue
118  * another notification to the driver.
119  */
120 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
121 			  int duration, enum ieee80211_roc_type type);
122 
123 /**
124  * iwl_mvm_stop_roc - stop remain on channel functionality
125  * @mvm: the mvm component
126  * @vif: the virtual interface for which the roc is stopped
127  *
128  * This function can be used to cancel an ongoing ROC session.
129  * The function is async, it will instruct the FW to stop serving the ROC
130  * session, but will not wait for the actual stopping of the session.
131  */
132 void iwl_mvm_stop_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
133 
134 /**
135  * iwl_mvm_remove_time_event - general function to clean up of time event
136  * @mvm: the mvm component
137  * @vif: the vif to which the time event belongs
138  * @te_data: the time event data that corresponds to that time event
139  *
140  * This function can be used to cancel a time event regardless its type.
141  * It is useful for cleaning up time events running before removing an
142  * interface.
143  */
144 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
145 			       struct iwl_mvm_vif *mvmvif,
146 			       struct iwl_mvm_time_event_data *te_data);
147 
148 /**
149  * iwl_mvm_te_clear_data - remove time event from list
150  * @mvm: the mvm component
151  * @te_data: the time event data to remove
152  *
153  * This function is mostly internal, it is made available here only
154  * for firmware restart purposes.
155  */
156 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
157 			   struct iwl_mvm_time_event_data *te_data);
158 
159 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm);
160 void iwl_mvm_roc_done_wk(struct work_struct *wk);
161 
162 void iwl_mvm_remove_csa_period(struct iwl_mvm *mvm,
163 			       struct ieee80211_vif *vif);
164 
165 /**
166  * iwl_mvm_schedule_csa_period - request channel switch absence period
167  * @mvm: the mvm component
168  * @vif: the virtual interface for which the channel switch is issued
169  * @duration: the duration of the NoA in TU.
170  * @apply_time: NoA start time in GP2.
171  *
172  * This function is used to schedule NoA time event and is used to perform
173  * the channel switch flow.
174  */
175 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
176 				struct ieee80211_vif *vif,
177 				u32 duration, u32 apply_time);
178 
179 /**
180  * iwl_mvm_te_scheduled - check if the fw received the TE cmd
181  * @te_data: the time event data that corresponds to that time event
182  *
183  * This function returns true iff this TE is added to the fw.
184  */
185 static inline bool
186 iwl_mvm_te_scheduled(struct iwl_mvm_time_event_data *te_data)
187 {
188 	if (!te_data)
189 		return false;
190 
191 	return !!te_data->uid;
192 }
193 
194 /**
195  * iwl_mvm_schedule_session_protection - schedule a session protection
196  * @mvm: the mvm component
197  * @vif: the virtual interface for which the protection issued
198  * @duration: the duration of the protection
199  * @wait_for_notif: if true, will block until the start of the protection
200  */
201 void iwl_mvm_schedule_session_protection(struct iwl_mvm *mvm,
202 					 struct ieee80211_vif *vif,
203 					 u32 duration, u32 min_duration,
204 					 bool wait_for_notif);
205 
206 /**
207  * iwl_mvm_rx_session_protect_notif - handles %SESSION_PROTECTION_NOTIF
208  */
209 void iwl_mvm_rx_session_protect_notif(struct iwl_mvm *mvm,
210 				      struct iwl_rx_cmd_buffer *rxb);
211 
212 #endif /* __time_event_h__ */
213